Our Online Store have the new products: RFID antenna board. Currently it can work with JC10M24R and JCOP4 card chips.
Compared with normal cards, the antenna board module has a smaller size and fixed holes, which is easy to integrate in the IOT(Internet Of Things) project.

Search found 5 matches

by djordjem
Mon Aug 12, 2019 10:54 am
Forum: Questions & Answers
Topic: JCIDE error
Replies: 1
Views: 10030

JCIDE error

Hello everyone I have java Card Applet, where I am creating KeyAgreement object in Applets constructor. Problem is that JCIDE return an error (69 85 Condition of use not satisfied) when JCIDE try to install applet when debug is start. KeyAgreement object is with parameter KeyAgreement.ALG_EC_SVDP_DH...
by djordjem
Thu Apr 19, 2018 8:36 am
Forum: Questions & Answers
Topic: Multiply big numbers
Replies: 8
Views: 15345

Re: Multiply big numbers

You should know something important about javacard: 1. javacard is the mini subset of standard Java, so most of features, packages and classes are not supported in javacard. For example , class BigInterger, it is only available on standard Java (JDK) , if you use it on javacad, you can't build it s...
by djordjem
Wed Apr 18, 2018 8:06 am
Forum: Questions & Answers
Topic: Multiply big numbers
Replies: 8
Views: 15345

Re: Multiply big numbers

What format do you used? decimal or hexadecimal? The big number is modular multiplication algorithm, the decimal and hexadecimal are not the same, but the hexadecimal is easier. I'm using hexadecimal format. It's like private APIs defined by the company. Is big-end or little-end ? It's big-end. x =...
by djordjem
Tue Apr 17, 2018 11:27 am
Forum: Questions & Answers
Topic: Multiply big numbers
Replies: 8
Views: 15345

Multiply big numbers

Hello everyone Does anyone know how I can multiply two big numbers on javacard? I have two byte arrays size of 128 bytes. I was trying to implement code in link below but it doesn't work for me. https://stackoverflow.com/questions/36966764/using-rsa-for-modulo-multiplication-leads-to-error-on-java-c...
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